The cash-in and cash-out buttons, for instance, come in green and red so that a shopkeeper knows when they press the green button it means the sale has been completed and the red colour symbolises the expense. While designing the product, Mishra said a lot of emphasis was put on little things, like bigger buttons keeping the shopkeeper’s preference in mind.
Initially, they managed to take seven pre-orders of the device but Mishra and team soon started work on version two of the calculator. Mishra then went to a few shopkeepers and showed the prototype device to gauge their interest in the smart calculator. The first version of the ‘smart’ calculator Mishra developed was a Raspberry Pi-powered prototype of a device, featuring a keyboard and two buttons-one for credit and another for debit. After all, calculators have already proven to be devices that are a fast and convenient way to do calculations in minutes, all at the push of a few buttons. This was when Mishra, 21, decided to reimagine the calculator but the challenge was how to make it better. “The backbone of small businesses in India is still a calculator, whether you go from a jewellery store to a Kirana store,” he said. What they prefer is a simple calculator to perform the regular computations that are involved in everyday life. Mishra observed that small business owners are neither comfortable using the digital khata cash book mobile apps nor do they have the resources to invest in expensive billing machines. (Image credit: Praveen Mishra) Backbone of small businesses Also read | Jaipur-based startup behind mobile app that improves medication adherence in patients The ‘Made-in-India’ smart calculator supports Wi-Fi and a companion mobile app.
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